20296

Appears in sequences

• Number of figure 8's with 2n edges on the square lattice.at n=6A003304
• Number of partitions in parts not of the form 13k, 13k+3 or 13k-3. Also number of partitions with at most 2 parts of size 1 and differences between parts at distance 5 are greater than 1.at n=43A035951
• Number of prime alternating tangles (or knots) with two connected components.at n=9A067646
• a(n) = Sum_{k=0..n} Fibonacci(k) + (-1)^k*Fibonacci(k-1).at n=20A097132
• a(n) = 3*Fibonacci(n) + (-1)^n.at n=20A097133
• a(n) = 3*Fibonacci(2*n) + 1.at n=10A097136
• a(1)=1, a(n) = a(n-1) + n^5 if n odd, a(n) = a(n-1) + n^2 if n is even.at n=7A135095
• Central moment sequence of tr(A^4) in USp(6).at n=9A138545
• a(0)=1, a(1)=4, a(n) = a(n-1) + a(n-2) - 1.at n=20A187893
• Number of partitions p = [x(1), ..., x(k)], where x(1) >= x(2) >= ... >= x(k), of n such that max(x(i) - x(i-1)) = number of distinct parts of p.at n=50A241820
• The 240-degree spoke (or ray) of a hexagonal spiral of Ulam.at n=41A244805
• Irregular triangle read by rows: row n gives number of connected graphs on n nodes with forcing number k (n>=1, k>=0).at n=22A256980
• Expansion of Product_{i>=1, j>=1, k>=1} (1 - x^(i*j*k))/(1 + x^(i*j*k)).at n=34A321241